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Red Hat Bugzilla – Attachment 311857 Details for
Bug 455478
2.6.26 backport of "check physical address range in ioremap" into RHEL5-U3
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[patch]
Backported patch to address this problem.
rhel5u3-ioremap.patch (text/plain), 894 bytes, created by
Larry Woodman
on 2008-07-15 17:57:23 UTC
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Description:
Backported patch to address this problem.
Filename:
MIME Type:
Creator:
Larry Woodman
Created:
2008-07-15 17:57:23 UTC
Size:
894 bytes
patch
obsolete
>--- linux-2.6.18.noarch/arch/x86_64/mm/ioremap.c.orig 2008-07-15 13:08:00.000000000 -0400 >+++ linux-2.6.18.noarch/arch/x86_64/mm/ioremap.c 2008-07-15 13:09:41.000000000 -0400 >@@ -22,6 +22,11 @@ > #define ISA_START_ADDRESS 0xa0000 > #define ISA_END_ADDRESS 0x100000 > >+static inline int phys_addr_valid(unsigned long addr) >+{ >+ return addr < (1UL << boot_cpu_data.x86_phys_bits); >+} >+ > static inline void remap_area_pte(pte_t * pte, unsigned long address, unsigned long size, > unsigned long phys_addr, unsigned long flags) > { >@@ -171,6 +176,13 @@ void __iomem * __ioremap(unsigned long p > if (!size || last_addr < phys_addr) > return NULL; > >+ if (!phys_addr_valid(phys_addr)) { >+ printk(KERN_WARNING "ioremap: invalid physical address %lx\n", >+ phys_addr); >+ WARN_ON_ONCE(1); >+ return NULL; >+ } >+ > /* > * Don't remap the low PCI/ISA area, it's always mapped.. > */
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